Take another look at the item:

One day in class, Shantrell rested her head against the wall (A) and discovered (B) that she could hear the classical music that Mr. Nguyen played in his office on the other side. (C) The music promplty put her to sleep.

You wanted to do this:

One day in class, Shantrell rested her head against the wall. And discovered that she could hear the classical music that Mr. Nguyen played in his office on the other side. The music promptly put her to sleep.

A period after wall makes a problem. And discovered that she could hear ... is a lonely verb fragment, so it cannot stand alone as a complete sentence.

You might want to review the rules.

Go back to the sentence to try again.

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